4B [Scope of Convention (issues excluded): agency issues];

26A1 [Effective declaration of avoidance: notice to the other party required];

63A [Notice fixing addition final period for buyer's performance];

64A1 ; 64A21 ; 64C [Seller's right to avoid contract (grounds for avoidance): fundamental breach of contract; Buyer does not pay within additional period set by seller under art. 63; Timeliness of notice of avoidance];

74A [General rules for measuring damages: loss suffered as consequence of breach];

75A1 [Damages established by substitute transaction (substitute transaction after avoidance): resale by aggrieved seller]